Electronic Doorbell with Counter


Posted on Feb 6, 2014

This circuit uses a synthesized sound chip from Holtek, the HT-2811. This reproduces the sound of a ``ding-dong`` chiming doorbell. Additionally, the circuit includes a CMOS 4026 counter display driver IC to count your visitors..


Electronic Doorbell with Counter
Click here to download the full size of the above Circuit.




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